Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual é a elevação para port elizabeth?
 ###Tabelas: CREATE TABLE singles:_21_10_titles_11_runners-up (singles:_21_10_titles_11_runners-up_id AUTO_INCREMENT PRIMARY KEY, Result VARCHAR, No. INT, Date VARCHAR, Category VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE digital_channels (digital_channels_id AUTO_INCREMENT PRIMARY KEY, Channel INT, Video VARCHAR, Aspect VARCHAR, PSIP Short Name VARCHAR, Programming VARCHAR) CREATE TABLE 2007_2008_table (2007_2008_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try bonus VARCHAR) CREATE TABLE promotion_playoff (promotion_playoff_id AUTO_INCREMENT PRIMARY KEY, Position INT, Club VARCHAR, Played INT, Points INT, Wins INT, Draws INT, Losses INT, Goals for INT, Goals against INT, Goal Difference INT) CREATE TABLE stadiums (stadiums_id AUTO_INCREMENT PRIMARY KEY, Stadium VARCHAR, City VARCHAR, Capacity INT, Matches played INT, Overall attendance INT, Average attendance per match INT, Average attendance as % of Capacity VARCHAR, Overall goals scored INT, Average goals scored per match VARCHAR, Elevation VARCHAR)  
SELECT Elevation FROM stadiums WHERE City = Port Elizabeth